Patent classifications
G
PHYSICS
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G08
SIGNALLING
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G08B
SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
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25/00
Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
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G08B25/01
characterised by the transmission medium
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G08B25/06
using power transmission lines
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